lib/lzo: Update LZO compression to current upstream version
This commit updates the kernel LZO code to the current upstream version which
 features a significant speed improvement - benchmarking the Calgary and
 Silesia test corpora typically shows a doubled perfoemance in both
 compression and decompression on mpdern i386/x86_64/powerpc machines.

Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>